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Type 2 iodothyronine deiodinase is highly expressed in germ cells of adult rat testis

dc.creatorMagagnin Wajner, Simone
dc.creatorWagner, Márcia dos Santos
dc.creatorMelo, Rossana C N
dc.creatorParreira, Gleydes G.
dc.creatorChiarini-Garcia, Hélio
dc.creatorBianco, Antonio C.
dc.creatorFekete, Csaba
dc.creatorSánchez, Edith
dc.creatorLechan, Ronald M
dc.creatorMaia, Ana Luiza
dc.date.accessioned2017-06-30T03:42:21Z
dc.date.available2017-06-30T03:42:21Z
dc.date.issued2007es_ES
dc.identifier2139es_ES
dc.identifier.issn0022–0795es_ES
dc.identifier.urihttp://repositorio.inprf.gob.mx/handle/123456789/6794
dc.identifier.urihttps://doi.org/10.1677/JOE-07-0106es_ES
dc.language.isoenges_ES
dc.publisherSociety for Endocrinologyes_ES
dc.relation194, 47-54 p.es_ES
dc.relationversión del editores_ES
dc.rightsacceso cerradoes_ES
dc.titleType 2 iodothyronine deiodinase is highly expressed in germ cells of adult rat testises_ES
dc.typearticlees_ES
dc.contributor.affiliationEndocrine Division, Thyroid Section, Hospital de Clı´nicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Braziles_ES
dc.relation.jnabreviadoJ ENDOCRINOLOGYes_ES
dc.relation.journalJournal of Endocrinologyes_ES
dc.identifier.placeGran Bretañaes_ES
dc.date.published2007es_ES
dc.identifier.organizacionInstituto Nacional de Psiquiatría Ramón de la Fuente Muñizes_ES
dc.identifier.doi10.1677/JOE-07-0106es_ES
dc.description.abstractotrodiomaThe testis has been classically described as a thyroid hormone unresponsive tissue, but recent studies indicate that these hormones might play an important role in developing testes. We have previously demonstrated that type 2 iodothyronine deiodinase (D2), a thyroid hormone-activating enzyme, is expressed in adult rodent testis and that its activity is induced by hypothyroidism. Nevertheless, the precise location of D2 in testis is not known. The aim of the present work was to determine the testicular cell types in which D2 is expressed using real-time PCR analysis, in situ hybridization histochemistry, and determination of D2 activity in cell fractions isolated from adult euthyroid and/or hypothyroid rat testis. The D2 mRNA levels in germ cells were higher than those from somatic cells (6.94G1.49 vs 2.32G0.79 arbitrary units (au); PZ0.017). Hypothyroidism increased D2 expression in germ cells (6.94G1.49 vs 8.78G5.43 au, PZ0.002) but did not change D2 transcripts in somatic cells significantly (2.12G0.79 vs 2.88G1.39 au, PZ0.50). In situ hybridization analysis showed that D2 mRNA is specifically present in elongated spermatids undergoing differentiation, whereas other germ cell types and Sertoli cells of seminiferous epithelium and the interstitial cells were virtually negative for this enzyme. The enzyme activity measured in germ and somatic isolated cell fractions (0.23G0.003 vs 0.02G 0.013 fmol/min per mg protein respectively; P!0.001) further confirmed the real-time PCR and in situ hybridization results. Hence, our findings demonstrated that D2 is predominantly expressed in elongated spermatids, suggesting that thyroid hormone might have a direct effect on spermatogenesis in the adult ratses_ES


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